7th Topic 2: Force and Motion Look Back

How does friction act between surfaces?

• Perpendicular to the surfaces

• Parallel to the surfaces

• At a 45-degree angle to the surfaces

• In a circular motion

What does friction oppose?

• The motion of surfaces

• The color of surfaces

• The temperature of surfaces

• The size of surfaces

Tags

NGSS.3-PS2-1

Which of the following is true about unbalanced forces?

• They do not cause a change in motion

• They cause a change in motion

• They are always equal

• They always act in opposite directions

Tags

NGSS.MS-PS2-2

Which of the following scenarios involves unbalanced forces?

• A car parked on a flat road

• A ball thrown into the air

• A book on a shelf

• A picture hanging on a wall

Tags

NGSS.MS-PS2-2

What is the key difference between balanced and unbalanced forces?

• Balanced forces cause motion; unbalanced forces do not

• Balanced forces do not cause motion; unbalanced forces do

• Both cause motion

• Neither cause motion

Tags

NGSS.MS-PS2-2

What does a net force of zero mean?

• Forces are unbalanced

• The object is accelerating

• Forces are balanced

• The object is changing shape

Tags

NGSS.MS-PS2-2

What happens to an object when the net force is not zero?

• It remains at rest

• It moves at a constant speed

• It accelerates

• It decelerates

Tags

NGSS.MS-PS2-2

How is net force calculated when forces act in opposite directions?

• By adding the forces

• By multiplying the forces

• By subtracting the smaller force from the larger force

• By dividing the larger force by the smaller force

Tags

NGSS.MS-PS2-2

What is the net force when a 6 N force and a 5 N force are applied in opposite directions?

• 11 N

• 1 N

• 0 N

• 5 N

Tags

NGSS.HS-PS2-1

If a 20 N force and a 5 N force act in opposite directions, what is the net force?

• 25 N

• 15 N

• 5 N

• 20 N

Tags

NGSS.MS-PS2-2